MODERN DATABASE MGMT.(PEARSON CHANNEL)
13th Edition
ISBN: 9780136709299
Author: Hoffer
Publisher: PEARSON
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Chapter 2, Problem 2.19RQ
In addition to explaining what action is being taken, what else should a relationship definition explain?
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Entity-relationship diagrams have a specific function, which is explained below. And what kind of symbol is utilised to represent a relationship, and how does it function? In what way does the word "associative entity" convey that something is happening and what does it mean? Could you provide an example?
How does an entity-relationship diagram work and what precisely is it?
Draw an entity-relationship diagram, including minimum and maximum cardinality, for the
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Chapter 2 Solutions
MODERN DATABASE MGMT.(PEARSON CHANNEL)
Ch. 2 - Define each of the following terms: entity type...Ch. 2 - Match the following terms and definitions....Ch. 2 - Contrast the following terms: stored attribute;...Ch. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - State six general guidelines for naming data...Ch. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - State three conditions that suggest the designer...
Ch. 2 - List the four types of cardinality constraints,...Ch. 2 - Give an example, Other than those described in...Ch. 2 - What is the degree of a relationship? List the...Ch. 2 - Give an example (Other than those described in...Ch. 2 - Give an example of each of the following, other...Ch. 2 - Give an example of the use of effective (or...Ch. 2 - State a rule that says when to extract an...Ch. 2 - Prob. 2.18RQCh. 2 - In addition to explaining what action is being...Ch. 2 - For the Manages relationship in Figure 2-12a,...Ch. 2 - Explain the distinction between entity type and...Ch. 2 - Why is it recommended that every ternary...Ch. 2 - A cellular operator needs a database to keep track...Ch. 2 - Prob. 2.24PAECh. 2 - Answer the following questions concerning Figure...Ch. 2 - Prob. 2.26PAECh. 2 - You may have been assigned a CASE or a drawing...Ch. 2 - Consider the two E-R diagrams in Figure 2-25 Q,...Ch. 2 - Prob. 2.29PAECh. 2 - Are associative entities also weak entities? Why...Ch. 2 - Because Visio does not explicitly show associative...Ch. 2 - Figure 2-26 shows a grade report that is mailed to...Ch. 2 - Prob. 2.33PAECh. 2 - The Is Married To relationship in Figure 2-12a...Ch. 2 - Figure 2-27 represents a situation of students who...Ch. 2 - Figure 2-28 shows two diagrams (A and B), both of...Ch. 2 - Prob. 2.37PAECh. 2 - Review Figure 2-8LQ and Figure 2-22. Identify any...Ch. 2 - Prob. 2.39PAECh. 2 - Prob. 2.40PAECh. 2 - Prob. 2.41PAECh. 2 - Prob. 2.42PAECh. 2 - Prob. 2.43PAECh. 2 - Prob. 2.44PAECh. 2 - Prob. 2.45PAECh. 2 - Prob. 2.46PAECh. 2 - Prob. 2.47PAECh. 2 - Prob. 2.48PAECh. 2 - Draw an ERD for the following situation. (State...Ch. 2 - Prob. 2.50PAECh. 2 - Prob. 2.51PAECh. 2 - Review your answer to Problem and Exercise 2-49 if...
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- ENHANCE ENTITY RELATIOSHIP DIAGRAM The entity type PERSON has the following attributes: SSN, name, address (City/State/Zip), date of birth, age, and contact number. The entity also has the three subtypes: CAMPER, BIKER, AND RUNNER. Draw a separate diagram segment for each of the following situations: 1. At a given time, a person must be exactly one of three subtypes. 2. A person may or may not be one of these subtypes. However, a person who is one of these subtypes cannot at the same time be one of the other subtypes. 3. A person may or may not be the one of these subtypes. On the other hand, a person may be any two (or even three) of these subtypes at the same time. 4. At a given time, a person must be at least one of these subtypes.arrow_forwardDraw an Entity Relationship Diagram for all of those below. Draw an ER diagram to represent information about students. A student is identified by his/her student number. Student’s name (first and last), permanent address, phone number, gender and date of birth are also stored. An airplane has a registration number, type, number of economy class seats, number of business class seats and the year of production. Some students live in student halls. Each hall has a name (unique) and an address. Each student has a number (unique) and a name. Assume that there are students living in every hall. Each text book has a unique ISBN (International Standard Book Number), and contains several chapters. Each chapter has a chapter number (unique within a book), the number of pages and the number of references. A chapter covers a single topic, but the same topic may be covered in various books. Each lecturer is identified by a unique number, name and phone. A lecturer teaches several courses, and for…arrow_forwardwhat can be very interesting about the Entity-Relationship (ER) Modeling that people may forget about ( i am not talking about the main function or explication but just a concept/part that people tend to overlook when they study it for the first time?arrow_forward
- Design an Entity-Relationship (E-R) diagram for a university management system. The system should capture information about the following: . Students, with the following attributes: student ID, name, date of birth, and email address. • Courses, with the following attributes: course ID, course name, and credit hours. • Professors, with the following attributes: professor ID, name, and email address. Additionally, consider the following relationships: • A student can enroll in multiple courses, and a course can have multiple students enrolled. • A course is taught by a single professor, and a professor can teach multiple courses. Show all entities, attributes, and relationships in your E-R. diagram, including the cardinality of cach relationship.arrow_forwardDraw an Entity relationship diagram (ER) for a university according to the following rules: ‐ For each student the university needs to keep track of: first name, last name, student id, address, phone no and their major. ‐ The student id is identical for each ‐ Each course has a number, name and credit. The course number is unique for each course. ‐ Each department has a name, code and The code is unique for each department. ‐ Each course may has one or more sections where each section is belong to only one ‐ A department offers one or many 7-‐ Some courses have perquisite courses. 8-‐ Each student could register in one or more courses. In your diagram you need to show the following: 1-‐ The primary key for each entity. 2-‐ The cardinality and participation between entities.arrow_forwardGive a simple example of an E-R diagram for each concept and then write the business rules for each example. associative entity weak entity unary relationshiparrow_forward
- Entity Relationship Diagram and Class Diagram are two diagramming techniques sharing common ancestry. Please contrast and compare the two. What are the similarities and the differences?arrow_forwardQ1. Draw an E-R Diagram for the following situation. At the university system each STUDENT must be assigned an ADVISOR who counsels students about degree requirements and helps students register for classes (COURSE). Each student must register (REGISTRATION) for classes with the help of an advisor, but if the student's assigned advisor is not available, the students may register with any advisor, We must keep track of students, the assigned advisor for each, and the name of the advisor with whom the students registered for the current term. Tips: Attributes of STUDENT include Student ID (the identifier), Name, and Major. Attributes of ADVISOR include Advisor ID (the identifier), Name, and Department. Attributes of COURSE include Course ID (the identifier), Title, and Credits. Attributes of REGISTRATION include Semester, and Year. Based on your background, think of logical and standard relationships between the given entities.arrow_forwardCreate an Interaction Model Use Case Model 1. Create use case summaries for a Employee Payroll System, Some suggested names are: Enter employee information, Print employee pay Snub, Perform maintenance, Perform backup, View employee records, etc. 2. Create a use case description for “Print Employee Pay Snub"...You should have several use case descriptions but only list one for this assignment. 3. Create a Use Case diagram for an Employee Payroll System, Include at least 3 actors. Sequence Model 1. Create a Scenario for a sequence of events that occur during one particular execution the system This should be listed as one of the actors (or whatever you chose to name them) in the use case diagram. 2. Create a Sequence Diagram Note: there should be a Sequence diagram for each Use Case listed in your use case summary, (if there are 4 Use Cases there should be 4 Sequence Diagrams).arrow_forward
- How are entity-relationship diagrams used? What kind of symbol is utilized to represent a relationship? What does the term "associative entity" mean? Give an example.arrow_forwardDraw a simple class diagram that shows the following business rules. Include the multiplicities for each relationship. An employee has one office number, and a unique office number is assigned to an employee. A student club should at least have one student, and a student can join many other clubs in the university. A bank branch can have zero or more customers and each customer is on one and only one branch.arrow_forwardDraw an entity relationship (ER) diagram of subject enrollment through LMS.arrow_forward
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Enhanced Entity Relationship Model; Author: Data Science Center;https://www.youtube.com/watch?v=ocQUtXPumdQ;License: Standard YouTube License, CC-BY